Clamp or holder for writing pads or blocks



F. MARTENS. CLAMP 0R HOLDER FOR WRITING PADS 0R BLOCKS.

APPLICATION man N01. 1. 1917. I

Patented Feb. 21, 1922.

2 SHEETS-SHEET I.

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FmH c J Lid d VI/Q V K F. MARTENS.

CLAMP 0R HOLDER FOR WRITING PADS 0R BLOCKS.

APPLICATION FILED NOV. I. 19!?- Iatented Feb. 21, 1922.

FRIEDRICH IVIARTENS, OF HAMBURG, GERMANY, 'ASSIGNOR, BY MESNE ASSIGNMENTS,

TO THE CHEMICAL FOUNDATION, INC., A CORPORATION OF DELAWARE.

CLAMP OR HOLDER FOR WRITING PADS OR BLOCKS.

Specification of Letters Patent.

Patented Feb. 21, 1922.

Application filed November 1, 1917. Serial No. 199,798.

T 0 all whom it may concern Be it known that I, FRIEDRICH MARTENS, a subject of the German Emperor, and resident of: No. Tarpenbeckstrasse, Hamburg, Germany, have invented certain new and useful Improvements in a Clamp or Holder for Writing Pads or Blocks, (for which I have filed an application in Germany Sept. 15, 1915,) of which the following is a specification.

This invention relates to a clamping device or holder for a writing pad or block adapted. to prevent the unauthorized removal of writing pads or blocks used in public places, such as telephone calling stations, post offices, railway stations and the like. To this end the holder or clamp is provided with a front piece or cap constructed to hold the top or head of the writing pad so that it can be removed solely with the use of a key when the pad is to be exchanged or removed aiter the exhaustion of all the sheets. The holding action proper is effected within the cap by means of pins projecting through openings in the head of the pad.

The invention will be more clearly understood from the following description of the accompanying drawings, in which Figure l is a top plan view,

Figure 2 a longitudinal section, and

Figure 3 a transverse section of one constructional form of the invention taken on the line 3-3 of Fig. I.

Figure 4L- is a top plan view,

Figure 5 a section on the line AB of Figure 4:, and

Figure 6 a section on the line (3-D of Figure l of a second constructional form.

According to the first constructional form the clamp or holder comprises a box-shaped base a secured to which is the top piece or cap 6. Arranged on the underside of the base is a spring tongue 0 provided with pins 0 and 0 adapted to project through holes in the base. The head of the writing pad which is slipped in the cap 6 has perforations for the insertion of the pins 0 0 so that the writing pad is securely held in the cap. Arranged above the cap Z) in the holder portion a is a key-hole 7 for a key 9,

the hollow stem of which rotates about a pivot 75. The latter is secured in amember a ar ranged on the underside of the base-plate a and adapted to cover the spring tongue 6 at its upper end. The bit of the key is shaped so that during the rotation of the key it enters between the plate a and the spring tongue 0 forcing the latter back so that the pins 0 0 are withdrawn from the holes in the writing pad (Z. The head 01" the writing pad can then be removed and a fresh block inserted in its place. The spring tongue 0 is provided with a shaped recess (Figure 1) clearing the key hole f so that the writing pad cannot be removed without the aid oi an authorized key. For securing the clamp or holder on a fixed support the base plate a is provided with openings a a as, for the introduction of screws.

The second constructional form of the invention shown in Figures l to 6 is to be used where the removal of the writing pad need not be feared.

For this reason the key arrangement for the operation of the spring tongue 0 is dispensed with. The spring tongue 0 is, in this case, provided with a rectangular offset or lug i protruding from the base plate a through a slot f as shown. By pressing the lug 2' the pins 0 c are forced out of the holes in the writing pad enabling the latter to be withdrawn from the cap 6. In order to improve the hold ofthe pad within the cap, two further pins 0 -0 are shown arranged on the tongue 0 for engagement with requisite openings in the base plate a. These pins 0*, a do not project into the head of the pad but press the latter against the cap as shown in Figure 5.

What I claim is: i

A pad holder comprising a base plate having apertures, a clamping head mounted on said plate and adapted to engage a pad, a spring tongue secured below said plate, and pins on said tongue that are adapted to be projected through said apertures into en gagement with said pad.

Signed by me at Hamburg this thirty-first day of July, 1917.

FRIEDRICH MAR-TENS. 

